Fountain pen



FIG. 1 is a top, left front perspective view of a fountain pen showing my new design with the cap member in an "in use" position and the writing tip exposed;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view with the cap member in a closed position;

FIG. 4 is a front elevational view of FIG. 3;

FIG. 5 is a right side elevational view of FIG. 3; and,

FIG. 6 is a bottom plan view of FIG. 3. 

The ornamental design for fountain pen, as shown and described. 